(c) During one cycle of operation the working fluid in an engine engages in two work interactions and three heat interactions. The two work interactions are; 15 kJ to the fluid and 43 kJ from the fluid. The first and second heat interactions are; 75 kJ to the fluid and 41 kJ from the fluid. Determine the magnitude and direction of the third heat interaction.
Explanation
The first law of thermodynamics for a cycle states that the net heat transfer is equal to the net work transfer. We can use this principle to find the third heat interaction by subtracting the first and second heat interactions from the net work transfer.
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